After Celestia sent Nightmare Moon into her 1000-year exile, Nightmare Moon's most fanatic followers rose up and began a march on Canterlot to overthrow Celestia. The only thing between them and the Princess were the 189 Royal Guardsponies.

Cpl. Samuel Burns and his squad had been through hell while fighting the Germans. When a chance incident transports them to a new world, they try to hang up their rifles and settle down. But, when an old enemy arrives from Earth, what will they do?